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# Program to find largest kth index value of one list in Python

Suppose we have three values n, total, and k. Now consider a list of size n whose sum is same as total and where the absolute difference between any two consecutive elements is at most 1. We have to find the maximum value at index k of such a list.

So, if the input is like n = 5 total = 15 k = 3, then the output will be 4, because one possible list is like [3,2,3,4,3], maximum element that is found at index 3 is 4.

To solve this, we will follow these steps −

- x := 0
- do the following repeatedly, do
- a := k + 1
- s :=(x + x - a + 1) * floor if a/2
- a := n - k
- s := s +(x + x - a + 1) * floor of a/2
- s := s - x
- if s > total, then
- come out from loop

- x := x + 1

- return x - 1

## Example

Let us see the following implementation to get better understanding −

def solve(n, total, k): x = 0 while 1: a = k + 1 s = (x + x - a + 1) * a // 2 a = n - k s += (x + x - a + 1) * a // 2 s -= x if s > total: break x += 1 return x - 1 n = 5 total = 15 k = 3 print(solve(n, total, k))

## Input

5, 15, 3

## Output

4

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